821490113 has 2 divisors, whose sum is σ = 821490114. Its totient is φ = 821490112.

The previous prime is 821490101. The next prime is 821490157. The reversal of 821490113 is 311094128.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 773284864 + 48205249 = 27808^2 + 6943^2 .

It is a cyclic number.

It is not a de Polignac number, because 821490113 - 2¹⁰ = 821489089 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (821490013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410745056 + 410745057.

It is an arithmetic number, because the mean of its divisors is an integer number (410745057).

Almost surely, 2^821490113 is an apocalyptic number.

It is an amenable number.

821490113 is a deficient number, since it is larger than the sum of its proper divisors (1).

821490113 is an equidigital number, since it uses as much as digits as its factorization.

821490113 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 821490113 is about 28661.6488185868. The cubic root of 821490113 is about 936.5567830948.

The spelling of 821490113 in words is "eight hundred twenty-one million, four hundred ninety thousand, one hundred thirteen".